More than a week after the Federal Aviation Administration said New Mexico Airlines voluntarily grounded its fleet to address mechanical issues, the airline has at least one operating airplane.

The airline has a total of five planes.

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FAA spokesperson Lynn Lunsford confirmed the update and still won’t say what mechanical issues New Mexico Airlines is working on. However, he did confirm the FAA is now investigating New Mexico Airlines.

The FAA has confirmed the airline is under investigation in connection with the maintenance problems that prompted the airline to ground its fleet. Lunsford would not comment further.

New Mexico Airlines’ main hub is at the Albuquerque International Sunport. When their fleet was parked, New Mexico Airlines said they would reimburse passengers whose flights were canceled.

At the time passengers told KOAT that New Mexico Airlines gave them little heads up about their upcoming flights being cancelled and were frustrated by customer service which appeared to be hard to come by at the Sunport.